CN111423150B - Early strength water reducing agent for recycled aggregate concrete and preparation method thereof - Google Patents
Early strength water reducing agent for recycled aggregate concrete and preparation method thereof Download PDFInfo
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
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Abstract
The invention discloses an early strength water reducing agent for recycled aggregate concrete and a preparation method thereof, and relates to the technical field of building materials, wherein each 100 parts by weight of the early strength water reducing agent for the recycled aggregate concrete comprises the following components in parts by weight: kettle bottom material: 33-37.5 parts of water and 33-37.5 parts of polyether macromonomer; solution A: 3.1-3.4 parts of water, 3.1-3.4 parts of unsaturated carboxylic acid and 0.1-0.4 part of sodium methallyl sulfonate; and B, liquid B: 0.04-0.07 part of vitamin C, 0.14-0.17 part of chain transfer agent and 10-13 parts of water; and C, liquid C: 0.4-0.7 part of water and 0.13-0.16 part of initiator; 0.3-0.6 part of caustic soda flakes, 0.3-0.45 part of modifier and the balance of water. The early strength water reducing agent for recycled aggregate concrete has the advantages of shortening the setting time, increasing the early strength, reducing the water-cement ratio and increasing the freeze-thaw resistance of concrete.
Description
Technical Field
The invention relates to the technical field of water reducing agents for buildings, in particular to an early strength water reducing agent for recycled aggregate concrete and a preparation method thereof.
Background
The building industry is a large household generating garbage and is an important industry capable of applying garbage waste to regenerate resources, so that the comprehensive utilization of the building garbage not only can solve the environmental problems caused by the building garbage, but also is an effective way for solving the resources and protecting the ecological environment.
The recycled aggregate is the aggregate generated by crushing, cleaning and grading the waste concrete blocks, and the concrete using the recycled aggregate to partially or completely replace the natural aggregate is called recycled aggregate concrete. .
In the prior art, chinese patent application No. 201610580759.0 discloses a C30 recycled aggregate concrete and a preparation method thereof, and the dosage of each material in each cubic concrete is as follows: 220kg of cement, 30-120kg of regenerated micropowder cement admixture, 30-90kg of regenerated micropowder, 220kg of fly ash, 595kg of machine-made sand, 105 kg of regenerated fine aggregate, 200 kg of regenerated coarse aggregate, 360kg of crushed stone 440-: active construction garbage powder CaCl2Desulfurized gypsum and cement clinker2-8:0.21-2.1:0.1-1:15-21。
The existing recycled aggregate concrete can meet the requirements of maximizing the first cost utilization, saving resources and protecting the environment on the premise of service performance and durability.
However, the surface of the recycled aggregate is coated with a certain amount of cement mortar, the surface is rough, the edges and corners are more, the porosity of the cement mortar is large, the water absorption rate is high, in addition, in the process of disintegration and crushing of the concrete block, a large amount of micro cracks exist in the recycled concrete due to damage accumulation, the density and the surface density of the recycled aggregate are lower than those of the common aggregate, the water absorption rate is high, the water-cement ratio is increased, the setting time of the concrete is long, the early strength is lower, the water consumption is higher, and the freeze-thaw resistance effect is poorer.
Therefore, it is necessary to develop an early water reducing agent suitable for recycled aggregate concrete, which can shorten the setting time of concrete, increase the early strength, reduce the water-cement ratio and increase the freeze-thaw resistance of concrete.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide an early strength water reducing agent for recycled aggregate concrete, which has the advantages of shortening the setting time of concrete, increasing the early strength, reducing the water-cement ratio and increasing the freeze-thaw resistance effect of concrete.
The second purpose of the invention is to provide a preparation method of the early strength water reducing agent for recycled aggregate concrete, which has the advantages of simple preparation method and easy operation.
In order to achieve the first object, the invention provides the following technical scheme: an early strength water reducing agent for recycled aggregate concrete, wherein each 100 parts by weight of the early strength water reducing agent comprises the following components in parts by weight:
kettle bottom material: 33-37.5 parts of water and 33-37.5 parts of polyether macromonomer; solution A: 3.1-3.4 parts of water, 3.1-3.4 parts of unsaturated carboxylic acid and 0.1-0.4 part of sodium methallyl sulfonate; and B, liquid B: 0.04-0.07 part of vitamin C, 0.14-0.17 part of chain transfer agent and 10-13 parts of water; and C, liquid C: 0.4-0.7 part of water and 0.13-0.16 part of initiator; 0.3-0.6 part of caustic soda flakes, 0.3-0.45 part of modifier and the balance of water; the modifier is prepared by mixing super absorbent resin, air entraining agent, antifreezing agent and nano diatomite according to the mass ratio of 1:0.2-0.4:0.6-0.8: 0.3-0.5. By adopting the technical scheme, the polyether macromonomer, the initiator, the chain transfer agent and the like are used for polymerization reaction, the modifier is matched to prepare the early strength water reducing agent, the super absorbent resin has good water absorption and high water retention rate, the roughness of the surface of the recycled aggregate can be improved, the water consumption is reduced, the drying shrinkage is inhibited, the compressive strength is improved, the cohesiveness of concrete slurry can be obviously improved by the air entraining agent, the consistency is increased, and the initial density is reduced, so that the gas generating pressure in the slurry is reduced, the growth of bubbles is facilitated, the nano diatomite is added, the effect of further modifying the early strength water reducing agent is achieved, the effect of inducing the hydration reaction of the concrete and improving the microstructure of a hydration product is achieved, the compressive strength and the compactness of the concrete are improved, the shrinkage rate is reduced, the production period is shortened, and the crystal nucleus effect is achieved, on the basis of the original network structure of the concrete, and a new network structure taking the nano diatomite as a node is established, and the two network structures are combined with each other to form a stable three-dimensional network, so that the performance of the concrete is greatly improved, meanwhile, the concrete has a self-repairing function, the defects of cracks and the like are greatly reduced, the service life is prolonged, and the safety is improved.
Further, the super absorbent resin is prepared by the following method: mixing 5-10 parts of corn starch and 5-10 parts of acrylic acid in parts by weight, fully stirring, adding 10-15 parts of acrylamide, heating in a water bath to 75-80 ℃, adding 0.01-0.03 part of potassium persulfate and 0.001-0.003 part of N, N-methylene bisacrylamide, and stirring for 1-2 hours.
By adopting the technical scheme, the corn starch is directly combined with the acrylic acid monomer without gelatinization, the polymerization process is simple, the polymerization speed is high, the water absorption of the super absorbent resin is good, the water retention is strong, the compressive strength of concrete can be improved, the surface smoothness and the internal water content of the concrete are kept constant, the continuous proceeding of cement hydration is ensured, the early drying shrinkage is inhibited, the water precipitation on the surface of the concrete is reduced, the permeability of hardened concrete is reduced, the water-absorbing super absorbent resin can block pores and capillary pipelines in the concrete, the concrete is more compact, and the impermeability and the freezing resistance of the concrete are improved.
Further, the air entraining agent comprises the following components in parts by weight: 1.3-2.3 parts of sodium cocoanut alcohol sulfate, 1.3-1.7 parts of dodecyl dimethyl amine oxide, 2.5-3 parts of fatty amide propyl dimethyl betaine, 3-5 parts of aluminum powder and 1.8-2.4 parts of desulfurized gypsum.
By adopting the technical scheme, the fatty acyl propyl dimethyl betaine is an amphoteric surfactant and can increase the compatibility among raw materials, the dodecyl dimethyl amine oxide is a polar nonionic surfactant and can show strong ionicity or non-ionicity, and the dodecyl dimethyl amine oxide has excellent performances of increasing bubbles, stabilizing bubbles, dispersing, resisting static electricity and the like, and some aluminum powder particles are wrapped in the bubbles, so that the gas-forming environment of the aluminum powder particles is improved.
Further, the preparation method of the air entraining agent comprises the following steps: mixing fatty amide propyl dimethyl betaine and aluminum powder, adding desulfurized gypsum, mixing uniformly, drying at 80-90 deg.C for 4-8h, taking out, mixing uniformly with sodium cocoanut oil alcohol sulfate and dodecyl dimethyl amine oxide, and maintaining at constant temperature and constant pressure of 1-2MPa and 60-70 deg.C for 10-12 h.
By adopting the technical scheme, the aluminum powder and the fatty acyl are mixed according to the propyl dimethyl betaine, the added desulfurized gypsum is diluted, and the diluted desulfurized gypsum is dried and then mixed with the sodium cocoanut oil alcohol sulfate and the dodecyl dimethyl amine oxide, and is maintained at constant pressure and constant temperature, so that the prepared air entraining agent has a good air entraining effect, and the compressive strength of concrete can be increased.
Furthermore, the antifreezing agent is prepared by mixing water glass, slag powder and metakaolin according to the mass ratio of 3.5-3.7:0.3-0.5: 1.
By adopting the technical scheme, the main components of the slag and the metakaolin are silicon dioxide and aluminum oxide, the silicon dioxide and the aluminum oxide react with water glass, Si-O bonds and Al-O bonds are broken and bonded again to form a compact three-dimensional network structure, the soluble silicon can increase the bonding of particles in the polymer, so that the cementing material is more compact, the interface bonding is stronger, the anti-permeability capability is strong, and the freeze-thaw resistance effect is enhanced.
Further, the polyether macromonomer is one or a combination of more of prenyl polyoxyethylene ether, methyl propanol polyoxyethylene ether and methyl alkenyl polyoxyethylene ether.
Further, the unsaturated carboxylic acid is one or a combination of acrylic acid, methacrylic acid and fumaric acid.
Further, the chain transfer agent is one or a combination of several of mercaptopropionic acid, thioglycolic acid, mercaptoethanol and n-dodecyl mercaptan.
Further, the initiator is one or a combination of more of concentrated sulfuric acid, hydrogen peroxide, sodium persulfate and sodium bisulfite.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of an early strength water reducing agent for recycled aggregate concrete comprises the following steps: mixing water and a polyether macromonomer, stirring and dissolving to form a kettle bottom material, adding a solution C prepared by mixing water and an initiator into the kettle bottom material, mixing and stirring, adding a solution A prepared by mixing water, unsaturated carboxylic acid and sodium methallyl sulfonate and a solution B prepared by mixing vitamin C, a chain transfer agent and water, controlling the adding time of the solution A to be 2.5-3h and the adding time of the solution B to be 3-3.5h, stirring for 1-1.5h after the solution A and the solution B are added, adding caustic soda flakes and a modifier, supplementing water to 100 parts by weight, and uniformly stirring to obtain a finished product.
In conclusion, the invention has the following beneficial effects:
firstly, the water reducing agent is prepared through polymerization, the modifier prepared from the super absorbent resin, the air entraining agent, the antifreezing agent and the nano diatomite is added, the workability of the cement-based composite material is improved under the condition of increasing the water reducing effect of the water reducing agent, the micro pore channels of the concrete are blocked through the super absorbent resin, the hydration is accelerated, the setting time of the concrete is shortened, the early mechanical property is improved, the compactness is increased, and the impermeability and the antifreezing property can be enhanced and the durability is improved through the matching of the super absorbent resin, the air entraining agent and the antifreezing agent.
Secondly, the air entraining agent is prepared from the raw materials such as aluminum powder, desulfurized gypsum and fatty acyl according to propyl dimethyl betaine, the cohesiveness of the concrete is increased, the internal gas forming pressure of the concrete is reduced, the aluminum powder can be wrapped in bubbles, the bubble environment is improved, the compactness of the concrete is increased, the early strength is improved, and the frost resistance of the concrete is improved.
Thirdly, the slag powder, the metakaolin and the water glass are mixed to prepare the antifreezing agent, and a three-dimensional network structure can be formed in the concrete, so that the cohesiveness in the concrete is increased, the compactness is improved, and the impermeability and the freezing resistance are increased.
Detailed Description
The present invention will be described in further detail with reference to examples.
Super absorbent resin preparation examples 1 to 3
Preparation example 1: mixing 5kg of corn starch with 5kg of acrylic acid, stirring thoroughly, adding 10kg of acrylamide, heating in a water bath to 75 ℃, adding 0.01kg of potassium persulfate and 0.001kg of N, N-methylene-bisacrylamide, and stirring for 1 h.
Preparation example 2: mixing 8kg of corn starch with 8kg of acrylic acid, fully stirring, adding 13kg of acrylamide, heating in a water bath to 78 ℃, adding 0.02kg of potassium persulfate and 0.002kg of N, N-methylene-bisacrylamide, and stirring for 1.5 h.
Preparation example 3: mixing 10kg of corn starch with 10kg of acrylic acid, fully stirring, adding 15kg of acrylamide, heating in a water bath to 80 ℃, adding 0.03kg of potassium persulfate and 0.0013kg of N, N-methylene-bisacrylamide, and stirring for 2 hours.
Preparation examples 4 to 6 of air-entraining agent
Preparation example 4: mixing 2.5kg of fatty amide propyl dimethyl betaine and 3kg of aluminum powder, adding 1.8kg of desulfurized gypsum, uniformly mixing, drying at the temperature of 80 ℃ for 8 hours, taking out, uniformly mixing with 1.3kg of sodium cocoanut alcohol sulfate and 1.3kg of dodecyl dimethyl amine oxide, and maintaining at constant temperature and constant pressure at the temperature of 1MPa and 70 ℃ for 10 hours.
Preparation example 5: mixing 2.8kg of fatty acid amide propyl dimethyl betaine and 4kg of aluminum powder, adding 2.1kg of desulfurized gypsum, uniformly mixing, drying at 85 ℃ for 6h, taking out, uniformly mixing with 1.8kg of sodium cocoanut alcohol sulfate and 1.5kg of dodecyl dimethyl amine oxide, and maintaining at constant temperature and constant pressure at 1.5MPa and 65 ℃ for 11 h.
Preparation example 6: mixing 3kg of fatty amide propyl dimethyl betaine and 5kg of aluminum powder, adding 2.4kg of desulfurized gypsum, uniformly mixing, drying at the temperature of 90 ℃ for 4 hours, taking out, uniformly mixing with 2.3kg of sodium cocoanut alcohol sulfate and 1.7kg of lauryl dimethyl amine oxide, and maintaining at constant temperature and constant pressure at the temperature of 2MPa and 60 ℃ for 12 hours.
Examples
Example 1: the raw material proportion of the early strength water reducing agent for the recycled aggregate concrete is shown in table 1, and the preparation method of the early strength water reducing agent for the recycled aggregate concrete comprises the following steps:
mixing 33kg of water and 33kg of polyether macromonomer, stirring for dissolving to form a kettle bottom material, adding liquid C prepared by mixing 0.4kg of water and 0.13kg of initiator into the kettle bottom material, mixing and stirring, then adding liquid A prepared by mixing 3.1kg of water, 3.1kg of unsaturated carboxylic acid and 0.1kg of sodium methallylsulfonate and liquid B prepared by mixing 0.04kg of vitamin C, 0.14kg of chain transfer agent and 10kg of water, controlling the adding time of the liquid A to be 2.5h, controlling the adding time of the liquid B to be 3h, stirring for 1h after the liquid A and the liquid B are added, adding 0.3kg of flake alkali and 0.3kg of modifier, supplementing 16.39kg of water to 100kg, and uniformly stirring to obtain a finished product, wherein the polyether macromonomer is prenyl polyoxyethylene ether, the initiator is methacrylic acid, the chain transfer agent is thioglycolic acid, and the modifier is prepared from high-grade resin, an antifreezing agent, an air entraining agent and a water-absorbing agent in a mass ratio of 1:0.2:0.6:0.3, The nano diatomite is prepared by mixing nano diatomite, the super absorbent resin is prepared by preparation example 4, the air entraining agent is prepared by preparation example 1, the antifreezing agent is prepared by mixing water glass, slag powder and metakaolin according to the mass ratio of 3.5:0.3:1, the particle size of the slag powder is 10 mu m, the chemical composition of the slag powder is shown in table 2, the particle size of the metakaolin is 30 mu m, the chemical composition of the metakaolin is shown in table 3, and the particle size of the nano diatomite is 25 nm.
TABLE 1 raw material proportions of early strength water reducing agent for recycled aggregate concrete in examples 1 to 5
TABLE 2 main chemical composition of slag powder
| Composition (I) | SiO2 | Al2O3 | CaO | Fe2O3 | MgO | V2O5 |
| w/％ | 43.55 | 14.8 | 30.78 | 3.25 | 7.46 | 0.16 |
TABLE 3 main chemical composition of metakaolin
Example 2: the raw material proportion of the early strength water reducing agent for the recycled aggregate concrete is shown in table 1, and the preparation method of the early strength water reducing agent for the recycled aggregate concrete comprises the following steps:
mixing 34.5kg of water and 34.5kg of polyether macromonomer, stirring for dissolving to form a kettle bottom material, adding a solution C prepared by mixing 0.5kg of water and 0.14kg of initiator into the kettle bottom material, mixing and stirring, then adding a solution A prepared by mixing 3.2kg of water, 3.2kg of unsaturated carboxylic acid and 0.2kg of sodium methallylsulfonate and a solution B prepared by mixing 0.05kg of vitamin C, 0.15kg of chain transfer agent and 11kg of water, controlling the adding time of the solution A to be 2.8 hours, controlling the adding time of the solution B to be 3.3 hours, after the solution A and the solution B are added, stirring for 1.3h, adding 0.4kg caustic soda flakes and 0.35kg modifier, adding 11.81kg water to 100kg, stirring well to obtain the final product, the polyether macromonomer is methyl propanol polyoxyethylene ether, the initiator is sodium persulfate and sodium bisulfite with the mass ratio of 1:1, the unsaturated carboxylic acid is fumaric acid, and the chain transfer agent is mercaptoethanol and n-dodecyl mercaptan with the mass ratio of 1: 1.
Example 3: the raw material proportion of the early strength water reducing agent for the recycled aggregate concrete is shown in table 1, and the preparation method of the early strength water reducing agent for the recycled aggregate concrete comprises the following steps:
mixing 36kg of water and 36kg of polyether macromonomer, stirring for dissolving to form a kettle bottom material, adding a solution C prepared by mixing 0.6kg of water and 0.15kg of initiator into the kettle bottom material, mixing and stirring, adding a solution A prepared by mixing 3.3kg of water, 3.3kg of unsaturated carboxylic acid and 0.3kg of sodium methallylsulfonate and a solution B prepared by mixing 0.06kg of vitamin C, 0.16kg of chain transfer agent and 12kg of water, controlling the adding time of the solution A to be 3 hours, controlling the adding time of the solution B to be 3.5 hours, stirring for 1.5 hours after the solution A and the solution B are added, adding 0.5kg of flake alkali and 0.4kg of modifier, supplementing 7.23kg of water to 100kg, and stirring uniformly to obtain a finished product, wherein the polyether macromonomer is methyl alkenyl polyoxyethylene ether, the initiator is hydrogen peroxide, the unsaturated carboxylic acid is acrylic acid, and the chain transfer agent is mercaptopropionic acid.
Example 4: the early strength water reducing agent for recycled aggregate concrete is different from the early strength water reducing agent in example 1 in that the formula of raw materials is shown in Table 1.
Example 5: an early strength water reducing agent for recycled aggregate concrete is different from that in example 1 in that a modifier is prepared by mixing super absorbent resin, an air entraining agent, an antifreezing agent and nano kieselguhr in a mass ratio of 1:0.3:0.7:0.4, the super absorbent resin is prepared by preparation example 5, the air entraining agent is prepared by preparation example 2, and the particle size of the nano kieselguhr is 30 nm.
Example 6: an early strength water reducing agent for recycled aggregate concrete is different from that in example 1 in that a modifier is prepared by mixing super absorbent resin, an air entraining agent, an antifreezing agent and nano kieselguhr in a mass ratio of 1:0.4:0.8:0.5, the super absorbent resin is prepared by preparation example 6, the air entraining agent is prepared by preparation example 3, and the particle size of the nano kieselguhr is 35 nm.
Example 7: an early strength water reducing agent for recycled aggregate concrete, which is different from the early strength water reducing agent in example 1, is prepared by mixing water glass, slag powder and metakaolin in a mass ratio of 3.6:0.4:1, wherein the particle size of the slag powder is 20 microns, the chemical composition of the slag powder is shown in Table 2, the particle size of the metakaolin is 40 microns, and the chemical composition of the metakaolin is shown in Table 3.
Example 8: an early strength water reducing agent for recycled aggregate concrete, which is different from the early strength water reducing agent in example 1, is prepared by mixing water glass, slag powder and metakaolin in a mass ratio of 3.7:0.5:1, wherein the particle size of the slag powder is 30 microns, the chemical components of the slag powder are shown in Table 2, and the particle size of the metakaolin is 50 microns, the chemical components of the metakaolin are shown in Table 3.
Comparative example
Comparative example 1: the early strength water reducing agent for recycled aggregate concrete is different from the early strength water reducing agent in example 1 in that a super absorbent resin is not added to a modifier.
Comparative example 2: the early strength water reducing agent for recycled aggregate concrete is different from the early strength water reducing agent in example 1 in that nano diatomite is not added into a modifier.
Comparative example 3: an early strength water reducing agent for recycled aggregate concrete, which is different from the early strength water reducing agent in example 1 in that sodium cocoanut alcohol sulfate and lauryl dimethyl amine oxide are not added in an air entraining agent.
Comparative example 4: an early strength water reducing agent for recycled aggregate concrete is different from the early strength water reducing agent in example 1 in that the air-entraining agent is selected from air-entraining agents sold by Jinan Baoli chemical Co., Ltd and having the model number of BP 92.
Comparative example 5: an early strength water reducing agent for recycled aggregate concrete, which is different from example 1 in that the antifreezing agent is selected from an early strength antifreezing agent sold under the trade designation 112 by Zheng Zhou Shuaiqi commerce Co.
Comparative example 6: by using the early strength water reducing agent for recycled aggregate concrete prepared in example 1 of the chinese invention patent document with the application number of 201310072015.4 as a control, 20% of polycarboxylic acid water reducing agent, 2% of triisopropanolamine, 0.5% of triethanolamine, 10% of sodium thiocyanate, 10% of calcium formate and 57.5% of water.
Performance test
The early strength water reducing agent is prepared according to the methods in examples 1-8 and comparative examples 1-6, and is detected according to the standard in GB/T8076-2009 concrete admixture, and the detection result is shown in Table 4.
TABLE 4 results of the Performance test of the early Strength Water reducing Agents prepared in examples 1 to 8 and comparative examples 1 to 6
In the above table, "-" indicates that the coagulation time is advanced, and "+" indicates that the coagulation time is extended.
As shown in the data in Table 4, the early strength water reducing agents prepared in examples 1 to 8 have high water reducing rate and low gas content, and can reduce bleeding rate, shorten setting time and improve compressive strength.
Comparative example 1 because the super absorbent resin is not added in the modifier, the water reducing rate of the early strength water reducing agent prepared in comparative example 1 is reduced, the bleeding rate is increased, the effect of shortening the setting time is poor, and the compressive strength ratio is reduced, which shows that the super absorbent resin is added as the modifier, the water reducing effect and the early strength effect of the early strength water reducing agent can be improved, and the working performance of concrete is improved.
Comparative example 2 because nano diatomite is not added in the modifier, the setting time of the early strength water reducing agent prepared in comparative example 2 is advanced, but the effect is inferior to that of examples 1-6 of the invention, and the water reducing rate and the compressive strength are poor.
In comparative example 3, as the air entraining agent is not added with the sodium cocoanut alcohol sulfate and the dodecyl dimethyl amine oxide, the early strength water reducing agent has high gas content and smaller compressive strength.
Comparative example 4 has an effect of entraining air and early strength by using a commercially available air-entraining agent, but the effect is inferior to examples 1 to 6 of the present invention.
In comparative example 5, the compressive strength of the early strength water reducing agent is reduced compared with that of examples 1 to 6 due to the use of a commercially available antifreeze, and the early strength effect is not obvious.
Application example: the early strength water reducing agents prepared in examples 1 to 8 and comparative examples 1 to 6 were added to recycled aggregate concrete with a strength grade of 30MPa, the mix ratio of the recycled aggregate concrete was designed according to JCJ55-2011 "design rule for mix ratio of ordinary concrete", the mix ratio of concrete is shown in Table 5, the physical-mechanical properties of cement used in the recycled aggregate concrete are shown in Table 6, the properties of the recycled aggregate are shown in Table 7, the content of sand is 1.1%, the content of clods is 0.2%, the fineness modulus is 2.6, the fly ash is class F class II, the fineness modulus is 19.6%, the water demand ratio is 96%, the loss on ignition is 1.42%, the 28d activity index is 72%, the mineral powder is class S95 mineral powder, the fluidity ratio is 105%, the 28d activity index is 114%, and the early strength water reducing agents prepared in examples 1 to 8 and comparative examples 1 to 6 were added in the order of application example No. 1 to No. 14, the performance of the concrete was tested according to the following method, and the test results are shown in table 8:
1. compressive strength: detecting according to GB/T50081-2002 Standard of mechanical property test method of common concrete; 2. setting time: detecting according to JGJ-T70-2009 Standard test method for basic performance of building mortar; 3. slump and spread: detecting according to GB/T50080-2002 Standard of Performance test method of common concrete mixture; 4. loss of freeze-thaw strength: monitoring is carried out according to GB/T50082-2009 Standard test method for long-term performance and durability of common concrete.
TABLE 5 raw material ratio of recycled aggregate concrete
TABLE 6 physico-mechanical Properties of the cements
TABLE 7 technical Properties of recycled aggregates
| Apparent density (g/cm3) | Water absorption/%) | Content of micro powder/% | Content of mud pieces/%) | Crush value index/%) |
| 2640 | 4 | 2.6 | 0.2 | 15.8 |
TABLE 8 Performance test results of concrete applications Nos. 1 to 14
As can be seen from the data in Table 8, the recycled aggregate concrete prepared in examples 1 to 8 of the present invention has a short initial setting time, a large early compressive strength, good workability, less slump loss, a large compressive strength, a good bonding strength, a strong water-retaining property and a strong plasticity-retaining property, and a long setting time.
Comparative example 1 because the super absorbent resin is not added in the modifier, the early strength water reducing agent prepared in comparative example 1 is doped into concrete, the initial setting time of the concrete is fast, and the early strength compressive strength is high, which shows that the super absorbent resin is added as the modifier, the setting time and early strength effect of the early strength water reducing agent can be improved, and the working performance of the concrete is improved.
Comparative example 2 because nano-diatomite is not added in the modifier, the early strength water reducing agent prepared in comparative example 2 enables the setting time of concrete to be longer and the early compressive strength to be smaller.
In the proportion 3, because the air entraining agent is not added with the sodium cocoanut alcohol sulfate and the dodecyl dimethyl amine oxide, the air content of the concrete is larger, and the compressive strength is smaller.
Comparative example 4 the air-entraining effect was inferior to that of examples 1 to 6 of the present invention because a commercially available air-entraining agent was used, and the early strength compressive strength of the concrete was small when it was blended into the concrete.
Comparative example 5 is a commercial antifreeze, so that the freeze-thaw loss of concrete is large, and comparative example 6 is an early strength water reducing agent prepared by the prior art, which is mixed into concrete, so that the freeze-thaw loss of concrete is large, and the frost resistance of concrete is poor.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. The early strength water reducing agent for recycled aggregate concrete is characterized by comprising the following components in parts by weight per 100 parts by weight:
kettle bottom material: 33-37.5 parts of water and 33-37.5 parts of polyether macromonomer; solution A: 3.1-3.4 parts of water, 3.1-3.4 parts of unsaturated carboxylic acid and 0.1-0.4 part of sodium methallyl sulfonate; and B, liquid B: 0.04-0.07 part of vitamin C, 0.14-0.17 part of chain transfer agent and 10-13 parts of water; and C, liquid C: 0.4-0.7 part of water and 0.13-0.16 part of initiator; 0.3-0.6 part of caustic soda flakes, 0.3-0.45 part of modifier and the balance of water;
the modifier is prepared by mixing super absorbent resin, air entraining agent, antifreezing agent and nano diatomite according to the mass ratio of 1:0.2-0.4:0.6-0.8: 0.3-0.5;
the antifreezing agent is prepared by mixing water glass, slag powder and metakaolin according to the mass ratio of 3.5-3.7:0.3-0.5: 1;
the super absorbent resin is prepared by the following method: mixing 5-10 parts of corn starch and 5-10 parts of acrylic acid in parts by weight, fully stirring, adding 10-15 parts of acrylamide, heating in a water bath to 75-80 ℃, adding 0.01-0.03 part of potassium persulfate and 0.001-0.003 part of N, N-methylene bisacrylamide, and stirring for 1-2 hours;
the air entraining agent comprises the following components in parts by weight: 1.3-2.3 parts of sodium cocoanut alcohol sulfate, 1.3-1.7 parts of dodecyl dimethyl amine oxide, 2.5-3 parts of fatty amide propyl dimethyl betaine, 3-5 parts of aluminum powder and 1.8-2.4 parts of desulfurized gypsum.
2. The early strength water reducing agent for recycled aggregate concrete according to claim 1, characterized in that the air entraining agent is prepared by the following method: mixing fatty amide propyl dimethyl betaine and aluminum powder, adding desulfurized gypsum, mixing uniformly, drying at 80-90 deg.C for 4-8h, taking out, mixing uniformly with sodium cocoanut oil alcohol sulfate and dodecyl dimethyl amine oxide, and maintaining at constant temperature and constant pressure of 1-2MPa and 60-70 deg.C for 10-12 h.
3. The early strength water reducing agent for recycled aggregate concrete according to claim 1, wherein the polyether macromonomer is one or a combination of prenyl polyoxyethylene ether, methyl propanol polyoxyethylene ether and methyl alkenyl polyoxyethylene ether.
4. The early strength water reducing agent for recycled aggregate concrete according to claim 1, wherein the unsaturated carboxylic acid is one or a combination of acrylic acid, methacrylic acid and fumaric acid.
5. The early strength water reducing agent for recycled aggregate concrete according to claim 1, wherein the chain transfer agent is one or a combination of mercaptopropionic acid, thioglycolic acid, mercaptoethanol and n-dodecyl mercaptan.
6. The early strength water reducing agent for recycled aggregate concrete according to claim 1, wherein the initiator is one or a combination of more of concentrated sulfuric acid, hydrogen peroxide, sodium persulfate and sodium bisulfite.
7. The preparation method of the early strength water reducing agent for recycled aggregate concrete according to any one of claims 1 to 6, characterized by comprising the following steps: mixing water and a polyether macromonomer, stirring and dissolving to form a kettle bottom material, adding a solution C prepared by mixing water and an initiator into the kettle bottom material, mixing and stirring, adding a solution A prepared by mixing water, unsaturated carboxylic acid and sodium methallyl sulfonate and a solution B prepared by mixing vitamin C, a chain transfer agent and water, controlling the adding time of the solution A to be 2.5-3h and the adding time of the solution B to be 3-3.5h, stirring for 1-1.5h after the solution A and the solution B are added, adding caustic soda flakes and a modifier, supplementing water to 100 parts by weight, and uniformly stirring to obtain a finished product.
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| CN113372087B (en) * | 2021-07-19 | 2022-06-24 | 深圳市东大洋水泥制品有限公司 | Early-strength high-impermeability concrete and preparation method thereof |
| CN113955966B (en) * | 2021-12-10 | 2022-08-16 | 广东龙湖科技股份有限公司 | Multifunctional auxiliary agent for mortar, preparation method and gypsum-based light plastering mortar composition |
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